To give them the benefit of the doubt … I have seen people hand wind skeins into balls and they look exactly like one wound on a ball winder…so that could be the case here. I do remember her throwing the yarn.
At first glance my eyes went to the lace collar as machine made.

I’ve been thinking about this since you posted it, and I think the actual fabric looks machine made but more interesting to me is that she is knitting with ONE needle…….however, I watched old TWO WWI movies this weekend (Mrs Miniver and The White Cliffs of Dover), and Mrs. Miniver was knitting EXACTLY the same way, with (apparently) one needle. It was not crochet, it was knitting, she was throwing her yarn, and the fabric appeared knitted.

Either these two very distant (Mrs. Miniver, 1942 & Downton Abbey, 2011) dramatic films are making the same error or there’s more here than meets the eye.